Numerical calculation of concentration profiles within thermal diffusion column with continuous feed and draw-offs.
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概要
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Axisymmetric concentration profiles of an isotope separating thermal diffusion column with continuous feed and draw-offs were calculated by solving the convection-diffusion equation using Newton iterative method, where the flow variables are specified from the input data. Computations were performed for <SUP>36</SUP>Ar and <SUP>40</SUP>Ar gas mixture within the cylindrical column having inner hot radius of 0.15 mm and an outer cold radius of 7.5 mm, between which the temperature differs by 515 K. The rate of feed F, supplied into the middle-height point of the column, was varied from 2.72 x 10<SUP>-4</SUP> g/s (10 cm<SUP>3</SUP>/min at 25°C) to 5.45 x 10<SUP>3</SUP> g/s (200 cm<SUP>3</SUP>/min), while the cut θ, or the ratio of the upper drawing-off to feeding rates, from 0.1 to 0.9. The pattern of concentration profile depends largely on the value of the total transport (that is, θ F in the upper section and -(1-θ) F in the lower section), and the two different patterns are linked at the feed point. The effect of changes in hot wire temperature (723973 K, temperature differences: ΔT= 435685 K) and in cold wall radius (r<SUB>c</SUB>= 7.5 and 5 mm) were also analyzed to find the value of F/(ΔT•r<SUP>4</SUP><SUB>c</SUB>) less than 0.02/(s•K•cm) is necessary for effective separation.
- 一般社団法人 日本原子力学会の論文
著者
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Kanagawa Akira
Department Of Nuclear Engineering Faculty Of Engineering Nagoya University
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Yamamoto Ichiro
Department Of Chemistry Graduate School Of Science The University Of Tokyo
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YAMAGISHI Kunihiko
Department of Nuclear Engineering, Faculty of Engineering, Nagoya University
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